Sunan an-Nasa'i, Volume 2, Book 11, Hadith 933 (DarusSalam) ⓘ

It was narrated from Abdul-Jabbar bin Wa'il that : His father said: "I prayed behind the Messenger of Allah and when he said the takbir, he raised his hands to the bottom of his ears. When he recited: Not (the way) of those who earned Your anger, nor of those who went astray), he said: 'Amin,' and I could hear him although I was behind him. The Messenger of Allah heard a man saying: 'Al-hamdu lillahi, hamdan kathiran tayiban mubarakan fih, (Praise be to Allah, much good and blessed praise.)' When the Prophet said the salam and finished his prayer, he said: 'Who spoke those words during the prayer?' The man said: 'I did, O Messenger of Allah, but I did not mean anything bad thereby.' The Prophet said: "Twelve angels hastened (to take it) and nothing is stopping it going all the way to the Throne.'"

أَخْبَرَنَا عَبْدُ الْحَمِيدِ بْنُ مُحَمَّدٍ، قَالَ حَدَّثَنَا مَخْلَدٌ، قَالَ حَدَّثَنَا يُونُسُ بْنُ أَبِي إِسْحَاقَ، عَنْ أَبِيهِ، عَنْ عَبْدِ الْجَبَّارِ بْنِ وَائِلٍ، عَنْ أَبِيهِ، قَالَ صَلَّيْتُ خَلْفَ رَسُولِ اللَّهِ صلى الله عليه وسلم فَلَمَّا كَبَّرَ رَفَعَ يَدَيْهِ أَسْفَلَ مِنْ أُذُنَيْهِ فَلَمَّا قَرَأَ ‏{‏ غَيْرِ الْمَغْضُوبِ عَلَيْهِمْ وَلاَ الضَّالِّينَ ‏}‏ قَالَ ‏"‏ آمِينَ ‏"‏ ‏.‏ فَسَمِعْتُهُ وَأَنَا خَلْفَهُ ‏.‏ قَالَ فَسَمِعَ رَسُولُ اللَّهِ صلى الله عليه وسلم رَجُلاً يَقُولُ الْحَمْدُ لِلَّهِ حَمْدًا كَثِيرًا طَيِّبًا مُبَارَكًا فِيهِ فَلَمَّا سَلَّمَ النَّبِيُّ صلى الله عليه وسلم مِنْ صَلاَتِهِ قَالَ ‏"‏ مَنْ صَاحِبُ الْكَلِمَةِ فِي الصَّلاَةِ ‏"‏ ‏.‏ فَقَالَ الرَّجُلُ أَنَا يَا رَسُولَ اللَّهِ وَمَا أَرَدْتُ بِهَا بَأْسًا ‏.‏ قَالَ النَّبِيُّ صلى الله عليه وسلم ‏"‏ لَقَدِ ابْتَدَرَهَا اثْنَا عَشَرَ مَلَكًا فَمَا نَهْنَهَهَا شَىْءٌ دُونَ الْعَرْشِ ‏"‏ ‏.‏